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PHP Exercises: Create a new string using two given strings s1, s2, the format of the new string will be s1s2s2s1

PHP Basic Algorithm: Exercise-59 with Solution

Write a PHP program to create a new string using two given strings s1, s2, the format of the new string will be s1s2s2s1.

Sample Solution:

PHP Code :

<?php
function test($s1, $s2)
{
    return $s1 . $s2 . $s2 . $s1;
}

echo test("Hi", "Hello")."\n";
echo test("whats", "app");

Sample Output:

HiHelloHelloHi
whatsappappwhats

Flowchart:

Flowchart: Create a new string using two given strings s1, s2, the format of the new string will be s1s2s2s1.

PHP Code Editor:

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Previous: Write a PHP program to check three given integers (small, medium and large) and return true if the difference between small and medium and the difference between medium and large is same.
Next: Write a PHP program to insert a given string into middle of the another given string of length 4.

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC